1 Duke University School of Medicine, Durham North Carolina. Electronic address: swf12@duke.edu.
2 Department of Pediatrics, Children's Health and Discovery Initiative, Duke School of Medicine, Durham North Carolina.
3 University of Pennsylvania Perelman School of Medicine, Philadelphia Pennsylvania; Division of Adolescent Medicine, Children's Hospital of Philadelphia, Philadelphia Pennsylvania.
4 Department of Pediatrics, Children's Health and Discovery Initiative, Duke School of Medicine, Durham North Carolina; Duke-Margolis Center for Public Policy, Duke University, Durham North Carolina.